colorjs.io/src/spaces/a98rgb-linear.js

Let’s get serious about color

import RGBColorSpace from "../RGBColorSpace.js";

/** @import { Matrix3x3 } from "../types.js" */

// convert an array of linear-light a98-rgb values to CIE XYZ
// http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html
// has greater numerical precision than section 4.3.5.3 of
// https://www.adobe.com/digitalimag/pdfs/AdobeRGB1998.pdf
// but the values below were calculated from first principles
// from the chromaticity coordinates of R G B W

/**
 * Matrices used by this color space, also available as `A98RGB_Linear.M`
 * @type {Record<string, Matrix3x3>}
 */
// prettier-ignore
export const M = {
	toXYZ: [
		[ 0.5766690429101305,   0.1855582379065463,   0.1882286462349947  ],
		[ 0.29734497525053605,  0.6273635662554661,   0.07529145849399788 ],
		[ 0.02703136138641234,  0.07068885253582723,  0.9913375368376388  ],
	],
	fromXYZ: [
		[  2.0415879038107465,    -0.5650069742788596,   -0.34473135077832956 ],
		[ -0.9692436362808795,     1.8759675015077202,    0.04155505740717557 ],
		[  0.013444280632031142,  -0.11836239223101838,   1.0151749943912054  ],
	],
};

export default new RGBColorSpace({
	id: "a98rgb-linear",
	cssId: "--a98-rgb-linear",
	name: "Linear Adobe® 98 RGB compatible",
	white: "D65",
	M,
});